Improvement in stereopticons for dissolving views



N BELCHER.

Stereupticons for Dissolving-Views. ,A NO 149286, .PatentedApriI.7,1874.

Witnesses Inventor:

y@ MW @'@w UNTTED STATES PATENT OFFICE NATHANIEL BELOHEB, OF BQSTON,MASSACHUSETTS.

IMPROVEMENT IN STEREOPTICONS FR DISSQLVING VIEWS.

Specification forming part of Letters Patent No. 149,286, dated April 7,1874; application filed JanuaryT 14, 1874.

To all whom it may concern:

Be it known that I, NATEANIEL BELGHER, of Boston, in the county ofSuffolk, State of Massachusetts, have invented a certain new and usefulImprovement in Dissolving Stereopticons, of which the following is adescription sufficiently full, clear, and eXact to enable any personskilled in the art or science to which my invention appertains to makeand use the same, reference being had to the accompanying drawingforming a part of this specification, in which- Figure 1 is anisometrical perspective View of my improved stereopticon. Fig. 2 is asectional view of the illuminating mechanism.

Like letters refer to like parts in the dilferent figures of thedrawing.

My invention relates more especially to that class of stereopticons usedin exhibiting dissolving views by means of the OXyhydrogen or limelight; and consists in a novel construction and arrangement of theparts, as hereinafter more fully set forth, the object being to effect asaving in the gas used, at the same time producing better results thanhave heretofore been attained.

The simplicity of my invention renders an elaborate descriptionunnecessary.

In the drawing, A is the camera; B, the

gas-burner; C C, lime points disposed in holders projecting from thestandards D D. The burner B is mounted on the carriage F, which isarranged to slide on the V-shaped ways G G, being held in position onthe ways by the guides H H. The burner B is supplied with hydrogen andoxygen gas through the pipes E E', respectively, the light being thrownupon the picture, and the image magnified and projected upon the screenby the usual arrangement of lenses.

' From the above description the nature and operation of my inventionwill be readily understood by all conversant with such matters. Theslides or pictures for exhibition being arranged in the camera in theusual manner, and the lime points C C placed opposite their respectivelenses, gas is let on through the pipes E E', and the burner B lighted.The carriage F is then moved on its ways G Gr, until the jet is broughtinto contact with one of the points C, by which a powerful light will beproduced, the rays from which will be thrown directly or withoutreflection upon the first or double plano-convex lens, and thencethrough the magnifier to the screen. After the picture thus produced hasbeen exhibited as long as desirable, the carriage is moved until thegas-jet is brought into contact with the other lime point, and theremaining picture exhibited, during which the slide rst used can bechanged.

The beauty of an exhibition of this character is greatly enhanced by thedissolving effect produced by gradually withdrawing the light from onepicture and throwing it upon another, projecting it upon the samescreen. This can be accomplished more perfectly by means of my improvedilluminating apparatus than in any other manner of which I have anyknowledge. The burner B, being securely attached to the carriage F, isprevented from vibrating, and thereby causing the picture to dicker onthe screen, and is always brought into a correct position with respectto the points G (l, which cannot be done where a single burner is usedin the ordinary manner; and where two burners are used it is necessaryYto alternately let on and turn oi' the gas-an operation impossible toperform accurately or twice'alike without great care and the use ofperfectly-adjusted apparatus.

I sometimes use a single lime point, and mount it on the same carriagewith the burner B, stops being arranged on the slides G Gr, to gage themovements of the carriage, s0 that the point may always be brought to acorrect position with respect to the lens, but I prefer the methodshown.

I am aware that a single gas-jet and lime point have been used in acamera of this nature, in which thc tubes were set radially in the box,and the light reiiected orvthrown upon the screen by means of reflectorsdisposed on the outer side of the camera; but reflected light has beenfound to produce a far less brilliant picture than the direct raysobtained by my improved device. I therefore do not claim a camera soarranged and operated, nor any part thereof, when in and of itselfconsidered; but p What I claim is- In a camera for the exhibition ofdissolving' views, the illuminating apparatus described, consisting ofthe burner B, pipes E Ef, sliding carriage F, and lime points C C,arranged to operate substantially as and for the purpose specified.

Witnesses: NATHANIEL BELOHEB.

C. A. SHAW, H. E. METCALE.

